Is this a good idea?
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As to the second--you have to have a positive balance of energy to run any device--a heater powered by cold can't work.
But your first idea is a good one--in fact powering home air conditioners with electricity from solar power arrays is one of the main uses of solar technology.
Doing it for a car might work. A car is too small to carry the solar panels needed to power the car entirely--but it might be possible to power an AC unit with a solar panel built into the roof. At the least, it would help the gas mileage in the summer.
sounds like a great idea,,,
Done and done. for the heater check out Geothermal cold weather (snow or Ice) insulates the ground thus helping maintain a constant temp... don't have websites but I am sure you'll beable to find information out there if you want to.
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